Technical data

PROTHERM 100EC – CONVERSION TO LPG

Note: Conversion must only be carried out by a competent person

• Isolate boiler from the gas and electrical supplies.

• Remove boiler casing, sealed chamber and combustion chamber cover as described in Installation/Ser-

vicing Instructions.

• Disconnect flame sense electrode.

• Disconnect ignition lead at gas valve module.

• Disconnect ignition earth lead.

• Undo nuts securing gas supply pipe between burner and gas valve and remove pipe.

• Undo two locking nuts securing burner to base of sealed chamber.

• Pull main burner up and forward out of boiler.

Note: The washer between the burner and burner gas supply must be kept to use in reassembly.

•

Unscrew and remove two injector bars retaining screws and separate injector bar from burner.

• Fit new injector bar with marked diameter of injector ∅ 0,68 mm to the boiler in reverse order to removal.

• Readjust the gas valve.

GAS VALVE ADJUSTMENT

To adjust the minimum and maximum settings, proceed as follows:

• Gain access to the rear of the controls housing.

• Connect a manometer to the burner pressure test point (2) on

the gas valve.

Minimum setting

• Start boiler in Central Heating mode, boiler is working in mini-

mum output for 100 seconds.

• Adjust the gas valve minimum pressure using screw (C) on gas

valve. Turn clockwise to increase, anti-clockwise to decrease.

Maximum setting

• Start boiler in Domestic Hot Water mode.

• Adjust gas valve maximum pressure using screw (B). Turn clock-

wise to increase, anti-clockwise to decrease.

Note: It is first necessary to remove cover (A) to gain access to

screw (B).

Finaly

• Disconnect manometer and check for gas soundness.

• Check for gas soundness.

• Replace the PCB box and all covers.

• Stick the self-adhesive label (delivered with LPG conversion kit) bearing the information about the gas type

and the gas supply pressure on the visible place inside the boiler.

Inj. diam. Pmin Pmax

G20 (20 mbar) 1.07 mm 3 mbar 15.7 mbar

G30 (29 mbar) 0.68 mm 5.3 mbar 27.5 mbar

G31 (37 mbar) 0.68 mm 7 mbar 35.6 mbar